thethirdplanet
nounUK /ðə θɜːd ˈplænɪt/
US /ðə θɝːd ˈplænɪt/
Earth is called the third planet because it is the third one from the sun.
The third planet is the only place where people live.
RELATED WORDS
OTHER MEANINGS
2. A way to talk about Earth when counting planets outward from the sun.
Mercury is first, Venus is second, and the third planet is home.
3. A nickname for Earth in science books and space stories.
The story was about a spaceship leaving the third planet.
4. The place where all known living things exist.
Scientists look for life beyond the third planet.